CN111606632B - Low-shrinkage fast-setting gangue-based alkali-activated fast repairing material and preparation method thereof - Google Patents
Low-shrinkage fast-setting gangue-based alkali-activated fast repairing material and preparation method thereof Download PDFInfo
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- CN111606632B CN111606632B CN202010429308.3A CN202010429308A CN111606632B CN 111606632 B CN111606632 B CN 111606632B CN 202010429308 A CN202010429308 A CN 202010429308A CN 111606632 B CN111606632 B CN 111606632B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Abstract
The invention discloses a low-shrinkage fast-setting gangue-based alkali-activated fast repairing material and a preparation method thereof. The alkali-activated rapid repair material comprises the following components in parts by weight: 400-500 parts of coal gangue, 500-600 parts of slag micro powder, 40-50 parts of sodium hydroxide, 200-240 parts of industrial water glass, 30-70 parts of sulphoaluminate cement and 260-300 parts of water. The preparation method comprises the following steps: 1) uniformly mixing sodium hydroxide, industrial water glass and water to obtain an alkali solution; 2) uniformly mixing the coal gangue, the mineral powder and the sulphoaluminate cement; 3) adding an alkali solution into the mixed material, and stirring to obtain slurry; 4) pouring the slurry into a mould, removing the mould after 1d, and carrying out standard maintenance. The alkali-activated rapid repair material is more compact, reduces the proportion of holes smaller than 25mm, reduces shrinkage, further improves the compressive strength, and has short setting time and excellent comprehensive performance.
Description
Technical Field
The invention belongs to the technical field of alkali-activated materials, and particularly relates to a low-shrinkage fast-setting gangue-based alkali-activated rapid repair material and a preparation method thereof.
Background
Alkali-activated materials (AAM) refers to a novel cementitious material that is made of a material having pozzolan activity, and has high early strength and good durability. A great deal of environmental pollution caused by the accumulation of a great deal of waste coal gangue, such as land occupation, leaching of harmful elements and COx、SOx、NOxAnd the emission of pollutant gases and the like. Although coal gangue has been used for the production of lightweight aggregates, bricks, coal gangue also has the potential to replace cement. After the coal gangue is calcined at the high temperature of about 550-750 ℃, kaolinite in the components of the coal gangue is converted into amorphous metakaolinite, and the amorphous metakaolinite has better volcanic ash activity. The gangue-based alkali-activated material is prepared by mixing the gangue-based alkali-activated material with mineral powder with good volcanic ash activity and an alkali solution with certain activator parameters. The alkali-activated material is of interest because its properties meet the basic requirements of today's building materials and it has significantly lower environmental impact and superior properties than portland cement.
Since the 21 st century in China, almost a majority of roads are cement concrete pavements at present, a series of small problems of cracking, peeling, pitted surface and the like can occur on the road surface of a common road during the service period of materials, although the damage to the cement concrete pavement by the small problems can influence the passing function, the whole road surface cannot be broken and repaired again due to economic consideration, so that the road pavement can be quickly repaired by using a quick repairing technology under the condition.
The alkali-activated material has good durability and high early strength, and can be considered as a quick repairing material, but the shrinkage rate of the alkali-activated material is much larger than that of common Portland cement due to the characteristic of self reaction of the alkali-activated material. The drying shrinkage of the alkali-activated material is mainly affected by the reaction raw materials, the type of the activator, the amount of the reaction used, and the curing conditions. And different raw materials involve different chemical processes, and the alkali-activated binary material is structurally different from the alkali-activated monomer gelled material. At present, the shrinkage mechanism of alkali-activated materials has some theoretical supports, such as: C-S-H gel theory, gel instability theory and pore structure theory. The alkali-activated material can crack due to large shrinkage, and the service life of the repaired pavement is further influenced.
There are many strategies for improving shrinkage of alkali-activated cementitious materials, such as pressure forming; curing at high temperature; in the existing method for improving the alkali-activated material, the strength of the material can be weakened or the cost is too high and the steps are complicated by adding a shrinkage reducing agent, an expanding agent or some mineral admixtures, and the like, so that the popularization and the application of the material are limited.
Disclosure of Invention
The invention aims to provide a low-shrinkage fast-setting gangue-based alkali-activated fast repairing material and a preparation method thereof. The shrinkage of the alkali-activated material is improved, the mechanical property of the material is improved, the material is endowed with more excellent fluidity and quick-setting property, and the comprehensive performance is excellent.
In order to solve the technical problems, the invention adopts the following technical scheme:
the low-shrinkage fast-setting gangue-based alkali-activated fast repairing material comprises the following components in parts by mass:
coal gangue: 400 to 500 portions of
Slag micropowder: 500 to 600 parts by weight
Sodium hydroxide: 40 to 50 portions of
Industrial water glass: 200 to 240 portions of
Sulphoaluminate cement (SAC): 30 to 70 portions of
Water: 260 to 300 portions of
According to the scheme, the coal gangue is ball-milled, sieved by a 200-300-mesh sieve, and then calcined for 2 hours at 700-800 ℃.
According to the scheme, the average particle size of the slag micro powder is 0.9-2.5 mu m, and the specific surface area is more than 2.41m2/g。
According to the scheme, the Baume degree of the industrial water glass is 41-43 degrees, the alkali modulus is 2.80-2.90, and Na is added2O content of 9-11 wt%, SiO2The content is 29-30 wt%, and the solid content is 52-53%.
According to the scheme, in the sulphoaluminate cement, CaO accounts for 43-45%, MgO accounts for 1.2-1.5%, and Al2O319 to 20% of SiO26 to 8 percent.
The preparation method of the low-shrinkage fast-setting gangue-based alkali-activated fast repairing material specifically comprises the following steps:
1) uniformly mixing 40-50 parts of sodium hydroxide, 200-240 parts of industrial water glass and 260-300 parts of water to prepare a required alkali solution;
2) uniformly mixing 400-500 parts of coal gangue, 500-600 parts of mineral powder and 30-70 parts of sulphoaluminate cement to obtain a mixed material;
3) adding the aqueous alkali obtained in the step 1) into the mixed material obtained in the step 2), slowly stirring for 55-65 s, quickly stirring for 25-35 s, standing for 85-95 s, and finally quickly stirring for 55-65 s to obtain slurry, wherein the slow stirring speed is 50-70 r/min, and the quick stirring speed is 110-140 r/min;
4) pouring the slurry obtained in the step 3) into a mould, removing the mould after 1d and carrying out standard maintenance to obtain the low-shrinkage fast-setting coal gangue base-excited rapid repair material.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a low-shrinkage fast-setting gangue-based alkali-activated fast repairing material, wherein the addition of mineral powder is the key for improving the strength, but the shrinkage of the mineral powder is increased after the mineral powder is doped, so that the material has unstable volume and further cracks; because the components of the sulphoaluminate cement also contain the silicon-aluminum compound, the matching degree of the system is higher, the MgO in the sulphoaluminate cement can promote the polymerization reaction after being doped, and promote the generation of C- (A) -S-H gel and N- (A) -S-H gel of the coal gangue base alkali-activated material, so that the system is more compact, the proportion of holes smaller than 25mm is reduced, the shrinkage is reduced, the compressive strength is further improved, the fluidity is good, the setting time is short, and the durability of the system can be improved due to the compaction of the system; when the mixing amount of the sulphoaluminate cement is too small, the performance improvement effect is poor, when the mixing amount is too large, the alkali-activated material is easy to crack, and when the sulphoaluminate cement is mixed in a reasonable range, the comprehensive performance of the alkali-activated repairing material can be obviously improved.
2. The preparation method is simple, easy to implement, simple and easily available in raw materials, low in production cost and easy to popularize and apply.
Drawings
FIG. 1 is a graph showing the relationship between the weight loss and the Temperature (TG) of a cured alkali-activated material net slurry after the alkali-activated rapid repair material 28d was prepared in comparative examples 1 to 2 and examples 1 to 3.
FIG. 2 is a graph comparing the drying shrinkage of 28d for comparative example 2 and examples 1-3.
Detailed Description
The present invention will be described in detail with reference to the following examples, which should be construed as merely illustrative and not limitative.
The indexes of the raw materials used in the embodiment of the invention are as follows:
the coal gangue can pass through a 200-mesh sieve by a ball milling process to enable the particle size to be less than 0.074mm, and then is calcined for 2 hours at 700 ℃;
the average particle size of the slag micro powder is 0.9-2.5 mu m, and the specific surface area is more than 2.41m2/g；
The Baume degree of the industrial water glass is 42 degrees, the alkali modulus is 2.85, and Na is added2 O content 10 wt%, SiO2The content was 29.5% by weight, the solids content being 52.8%;
the sulphoaluminate cement is commercially available ordinary sulphoaluminate cement, CaO is 43-45%, MgO is 1.2-1.5%, and Al is2O319 to 20% of SiO26 to 8 percent.
Examples 1 to 3
The low-shrinkage fast-setting gangue-based alkali-activated fast repair material is provided, and the preparation method comprises the following steps:
1) uniformly mixing sodium hydroxide, industrial water glass and water to prepare a required alkali solution;
2) mixing the coal gangue, the mineral powder and the sulphoaluminate cement, and stirring at a low speed until the mixture is uniformly mixed;
3) adding the alkali solution obtained in the step 1) into the mixed material obtained in the step 2), slowly stirring for 60s, quickly stirring for 30s, standing for 90s, and finally quickly stirring for 60s to obtain slurry, wherein the slow stirring speed is 62 +/-5 r/min, and the quick stirring speed is 125 +/-10 r/min;
4) pouring the slurry obtained in the step 3) into a mould, removing the mould after 1d and carrying out standard maintenance to obtain the low-shrinkage fast-setting coal gangue base-excited rapid repair material.
The raw material ratios of examples 1 to 3 are shown in Table 1, the results of fluidity and compressive strength tests are shown in Table 2, the results of setting time tests are shown in Table 3, and the pore size distributions are shown in Table 4.
Comparative example 1
The specific preparation method of the alkali-activated rapid repair material is the same as that of the embodiment 1-3, except that the step 2) is not added with mineral powder and sulphoaluminate cement.
The raw material ratio of comparative example 1 is shown in table 1, the fluidity and compressive strength test results are shown in table 2, and the setting time test results are shown in table 3.
Comparative example 2
The specific preparation method of the alkali-activated rapid repair material is the same as that of the embodiment 1-3, except that no sulphoaluminate cement is added in the step 2).
Comparative example 2 the raw material ratios are shown in table 1, the results of fluidity and compressive strength tests are shown in table 2, the results of setting time tests are shown in table 3, and the pore size distributions are shown in table 4.
TABLE 1 raw material ratios (kg/m) of comparative examples 1-2 and examples 1-33)
TABLE 2 test results of fluidity and compressive strength of the repair materials obtained in comparative examples 1-2 and examples 1-3
Table 2 shows: the comparative examples 1 and 2 show that the mineral powder is used for replacing part of coal gangue, so that the fluidity and the compressive strength of the repairing material can be obviously improved. Examples 1-3 show that the strength of the repair material is improved after the modified material sulphoaluminate cement is added, wherein the strength is the highest in example 2, and the compressive strength of 1d, 7d and 28d is 31.1MPa, 49.4MPa and 61.1MPa respectively.
TABLE 3 test results of setting time of the alkali-activated repair materials obtained in comparative examples 1 to 2 and examples 1 to 3
The setting times of the comparative and the examples are less than 1h, and examples 1 to 3 show that the addition of sulphoaluminate cement has substantially no adverse effect on the setting time and the setting time is still accelerated.
FIG. 1 is a graph of weight loss versus temperature (TG-DTG) for cured alkali-activated material neat pastes after preparing alkali-activated rapid repair materials 28d for comparative examples 1-2 and examples 1-3, and mass loss at a temperature of 250 ℃ is a result of free water removal from C- (A) S-H gel and N- (A) -S-H gel. The figure shows that: the mass losses of comparative example 1, comparative example 2, example 1, example 2 and example 3 were 5.63%, 12.01%, 14.09%, 15.71% and 14.48%, respectively. The TG-DTG results indicate that the C- (A) -S-H gel and the N- (A) -S-H gel in the gangue-based alkali-activated material sample doped with the sulphoaluminate cement contain more water, and it can be inferred that a small amount of sulphoaluminate promotes the reaction, which is consistent with the 28d net slurry strength results in the above Table 2.
Fig. 2 is a graph showing a comparison of drying shrinkage of the alkali-activated rapid repair material 28d prepared in comparative example 2 and examples 1 to 3. The figure shows that: the sulphoaluminate cements of examples 1-3 all have shrinkage reducing effect on coal gangue based alkali-activated materials, wherein the shrinkage reducing effect of example 2 is the best.
TABLE 4 pore size distribution (%)
One of the main causes for shrinkage of alkali-activated materials is believed to be due to the partial pore size with a radius of 1.25nm to 25nm, classified according to the IUPAC International Union of pure and applied chemistry. The results of examples 1-3 show that the proportion of pores smaller than 25nm becomes smaller after the addition of the sulphoaluminate cement compared to comparative example 2, with the least pores smaller than 25nm in example 2.
The embodiment of the invention can obtain that the low-shrinkage fast-setting gangue-based alkali-activated fast repair material provided by the embodiment of the invention can actually reduce shrinkage, and the working performance and the mechanical performance are also improved.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (4)
1. A low-shrinkage fast-setting gangue-based alkali-activated fast repair material is characterized by comprising the following components in parts by mass:
coal gangue: 375 parts of (a) and (b),
mineral powder: 575 parts of a catalyst component which is a mixture of,
sodium hydroxide: 43 parts of (a) to (b),
industrial water glass: 220 parts of (a) to (b),
sulphoaluminate cement: 50 parts of (a) a mixture of (b),
water: 276 parts of;
wherein the average particle size of the mineral powder is 0.9-2.5 μm, and the specific surface area is more than 2.41m2(ii)/g; and (3) ball-milling the coal gangue, sieving the coal gangue by a 200-300-mesh sieve, and calcining the coal gangue for 2 hours at 700-800 ℃.
2. The alkali-activated rapid repair material as claimed in claim 1, wherein the industrial water glass has a baume degree of 41 to 43 ° and an alkali modulus of 2.80 to 2.90, Na2O content of 9-11 wt%, SiO2The content is 29-30 wt%, and the solid content is 52-53%.
3. The alkali-activated rapid repair material according to claim 1, wherein the sulphoaluminate cement contains 43 to 45% CaO, 1.2 to 1.5% MgO, and Al2O319 to 20% of SiO26 to 8 percent.
4. The preparation method of the low-shrinkage fast-setting gangue-based alkali-activated fast repair material as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
1) uniformly mixing 43 parts of sodium hydroxide, 220 parts of industrial water glass and 276 parts of water to prepare a required alkali solution;
2) uniformly mixing 375 parts of coal gangue, 575 parts of mineral powder and 50 parts of sulphoaluminate cement to obtain a mixed material;
3) adding the aqueous alkali obtained in the step 1) into the mixed material obtained in the step 2), slowly stirring for 55-65 s, quickly stirring for 25-35 s, standing for 85-95 s, and finally quickly stirring for 55-65 s to obtain slurry, wherein the slow stirring speed is 50-70 r/min, and the quick stirring speed is 110-140 r/min;
4) pouring the slurry obtained in the step 3) into a mould, removing the mould after 1d and carrying out standard maintenance to obtain the low-shrinkage fast-setting coal gangue base-excited rapid repair material.
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| CN113402892B (en) * | 2021-06-22 | 2022-11-18 | 武汉品泰新型建材有限公司 | Building rapid-setting repairing material and preparation system and preparation method thereof |
| CN116477884A (en) * | 2023-04-27 | 2023-07-25 | 内蒙古农业大学 | Composition for repairing pavement crack grouting, pavement crack grouting repair material and preparation method thereof |
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